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SLAC Publication: SLAC-PUB-16980
SLAC Release Date: May 25, 2017
CONTROL OF INTRA-BUNCH VERTICAL INSTABILITIES AT THE SPS- MEASUREMENTS AND TECHNOLOGY DEMONSTRATION
Fox, John.
We present recent measurements demonstrating control of unstable beam motion in single bunch and bunch train configurations at the SPS. The work is motivated by anticipated intensity increases from the LIU and HL-LHC upgrade programs \cite{LIU}, and has included the development of a GHz bandwidth reconfigurable 4 GS/S signal processor with wideband kickers and associated amplifiers. The system was operated at 3.2GS/s with 16 samples across a 5 ns RF bucket (4.2 ns 3$\sigma$ bunch at injection). ... Show Full Abstract
We present recent measurements demonstrating control of unstable beam motion in single bunch and bunch train configurations at the SPS. The work is motivated by anticipated intensity increases from the LIU and HL-LHC upgrade programs \cite{LIU}, and has included the development of a GHz bandwidth reconfigurable 4 GS/S signal processor with wideband kickers and associated amplifiers. The system was operated at 3.2GS/s with 16 samples across a 5 ns RF bucket (4.2 ns 3$\sigma$ bunch at injection). The experimental results confirm damping of intra-bunch instabilities in both Q20 and Q26 optics configurations for intensities of $2 \times10^{11}$ p/bunch. Instabilities with growth times of 200 turns are well-controlled from injection, consistent with the achievable gains for the 2 installed stripline kickers with 1 kW broadband power. Measurements from multiple studies in single-bunch and bunch train configurations show achieved damping rates, control of multiple intra-bunch modes, behavior of the system at injection and final damped noise floor. Show Partial Abstract
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  • Interest Categories: Accelerator Physics, Instrumentation/Development